The Musée de Cluny occupies two remarkable buildings: a 15th-century Gothic mansion and, beneath it, the best-preserved Gallo-Roman baths in France, dating from around 200 AD. The baths are extraordinary in themselves — vast vaulted chambers, astonishingly intact. The museum above holds France's finest collection of medieval art.
The unmissable works are the six Lady and the Unicorn tapestries, woven in Flanders around 1500 — six allegorical scenes of extraordinary richness and delicacy, recently reinstalled in a purpose-built darkened room. They represent the five senses plus a mysterious sixth ("À mon seul désir"). One of the great art experiences in Paris, and usually uncrowded.